Bummer. This is going to take some time I fear. But I am really glad you included the error code you are getting.
From what I know from helping someone with this issue before is that the LU100 error message means that you are trying to use a wrong User ID. Try using any IDs you may have used before. I know, it’s hard to remember these crazy things.
If you cannot remember your User ID, here is a link to try to recover it.